I've never understood how pronation of the forearm can be applied to throwing a football (not saying it's not crucial, just that i'm having a conceptual stumbling block).
If you hold a football, the tip of the football is pointing ahead of you. If you pronate your forearm, the tip of the football now faces to your right.
Don't you want the tip of the football to be pointing in the direction of your target when you throw it?
If so, how can you pronate your forearm while keeping the tip facing the target?